Programming instructions

Programming equipment settings
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If you need to connect more cooling elements than you have relays available and
you have an unused variable stage, you can use it as an ON/OFF stage (for 115/230
VAC-powered equipment only).
 Set the idle speed to 100% and idle range to the temperature at which you want
the stage to switch on/off.
 You no longer have variable speed or power; you have either full on or full off, the
same as a cooling relay. The set point and differential settings have no effect
when you use a variable stage this way.
How variable heating stages work
 When the temperature is above the heat cutoff, the heater is off.
 When the temperature drops below the heat cutoff, the heater is at the minimum load. The heater
continues to operate at minimum load until the temperature drops to the set point.
 When the temperature is between the set point and the differential, heater output increases or
decreases proportionally with the temperature.
 When the temperature is below the differential, the heater ois at full output.
0100
Temperature
Heater output
Heater output increases as the temperature drops, or
decreases as the temperature rises.
The heater is at its maximum output.
The heater is at its minimum heat output.
The heater is off.
Differential
Heat cutoff
Minimum load
Set point